[5.6][SE-0335] Introduce existential any
#40505
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to enable the 'any' keyword.
existential type spelled with `any`.
The new type, called ExistentialType, is not yet used in type resolution. Later, existential types written with `any` will resolve to this type, and bare protocol names will resolve to this type depending on context.
explicit existential types are enabled. Note that existential metatypes still resolve to ExistentialMetatypeType, but later this type can be replaced with ExistentialType(MetatypeType).
…ed()" This reverts commit eb1bd07.
…kUnsupportedProtocolType()" This reverts commit 15f88e9.
flip the return value in the implementation accordingly.
requirements to be spelled with 'any' when explicit existential types are enabled.
…lType when explicit existentials are enabled.
existential types are enabled.
existential types enabled.
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slavapestov
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Dec 10, 2021
AnthonyLatsis
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🍒 release cherry pick
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Cherry pick of #40282
Implementation for SE-0335 Introduce existential
any.The feature is currently behind the frontend flag
-enable-explicit-existential-types.Resolves: rdar://86032280